When Sgt Troy is in the store looking for a gift for his mother, there's a poster on the wall with the name Max Jennings, the writer who appeared in the previous episode.
This is the first episode in which the murderer doesn't die and is actually arrested.
Denyse Alexander plays Agnes Gray in this episode. She returns in episode 11.2, Blood Wedding (2008), in the role of Peggy Benson.